The file appears to be a specific segment of a multi-part RAR archive, likely containing firmware, software, or a sound library for the Go to product viewer dialog for this item. Guitar Effects Processor. How to Use This File
If the extracted files are guitar patches, this guide shows you how to import them into your device using Boss Tone Studio: Boss GT-1 Tutorial - How to Import & Export Patches GuitarNTabs YouTube• Jul 14, 2022 GT1.63_2GB.part30.rar
Once extracted, if the content consists of patches (usually .tsl files), you can manage them using official tools: The file appears to be a specific segment
: A large library of user-created or professional guitar tones. Managing Content for Boss GT-1 likely containing firmware